<?php
$h='';$m='';
list($h,$m)=split(':',$valor)
?>
<table border="0">
  <tr class="smalltext">
    <th align="left" bgcolor="#E6EEEE" scope="col">Hora:Minutos</th>
  </tr>
  <tr>
    <td><input type="text" value="<?=$h;?>" size="2" id="C4821_h" name="C4821_h" class="required" max="24"/>
      :
      <input type="text" value="<?=$m;?>" size="2" id="C4821_m" name="C4821_m" class="required" max="60"/></td>
  </tr>
</table>